Charles Bourseul

He made improvements to the telegraph system of L. F. Breguet (a French instrument maker) and Samuel F. B. Morse.

Charles Bourseul experimented with the electrical transmission of the human voice and developed an electromagnetic microphone, but his telephone receiver was unable to convert electric current back into clear human voice sounds.

In 1854 Bourseul wrote a memorandum on the transmission of the human voice by electric currents that was first published in a magazine L'Illustration (Paris), though no prototype was built.

That is about the same time that Meucci later claimed to have created his first attempt at the telephone in the United States of America.

I have made experiments in this direction; they are delicate and demand time and patience, but the approximations obtained promise a favourable result.”[citation needed]Bourseul died in Saint-Céré, France, at the age of 83.